Portage Learning CHEM 103 chemistry EXAM A+ GRADE ASSURED COMPLETE SOLUTIONS AND VERIFIED ANSWERS LATEST UPDATE!!!!

PORTAGE LEARNING EXAM zm zm




Exam Solution
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CHEM 103 Portage Learning Exam 2 (problem set) and
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exam studyguide 2026 A+ GRADE ASSURED COMPLETE
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SOLUTIONS AND VERIFIED ANSWERS (278E1)
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QUESTION 1 zm




Term
ANSWER

Definition



QUESTION 2 zm




Which observations and theories support the wave nature of light?
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ANSWER

- Christiaan Hygens work on refraction and reflection -
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Thomas Young used a screen with two slits to test the reflections of light and saw many lines refle
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cted, supporting the idea that light is made of waves. -
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James Clerk Maxwell's theory of electromagnetic radiation.s
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QUESTION 3 zm




Which observations and/or theories support the particle nature of light?
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ANSWER

-
Newton's law of motion (light was streams of extremely tiny particles traveling at high speeds acco
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rding to his laws of motion) - photoelectric effect - blackbody radiation
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QUESTION 4 zm

, What is the wavelength of microwave radiation with a frequency of 450 MHz? Equatio
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n: Equation with values substituted: Answer (with correct units and to 3 significant fig
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ures):
ANSWER

λ = C/V 450 MHz -
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> Hz = 450 x 1 x 10 ^6Hz = 4.5 x 10^8 λ = 2.998 x 10^8m/s / 4.5 x 10^8 λ=0.6662
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QUESTION 5 zm




What is the energy of a photon being emitted by a radio wave that has a wavelength
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of 180 m? Equation: Equation with values substituted: Answer (with correct units and
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to 3 significant figures):
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ANSWER

E = hc/λ E = (6.626 x 10^-34js)(2.998 x 10^8m/s) / 180m E = 1.10 x 10^-26j
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QUESTION 6 zm




What are the main features from Bohr's model of the hydrogen atom that apply to all
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models used to describe the distribution of electrons in an atom?
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ANSWER

- The energies of electrons (energy levels) in an atom are quantized. -
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An electron's energy increases with increasing distance from the nucleus. -
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The discrete energies of light emitted by elements in an excited state result from quantized electro
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nic energies.
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QUESTION 7 zm




A source of energy promotes an electron in a hydrogen atom from ground state into a
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n orbit with n = 8. What is the calculated energy (in Joules) of the electron in this exc
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ited state? Equation: Equation with values substituted: Answer (with correct units and
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mto 3 significant figures):
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ANSWER

En=-K/n2 En= - (2.179 x 10-18J)/82 En= -3.40 x 10-20J
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QUESTION 8 zm




An electron in a hydrogen atom transitions from an orbit with n = 4 to the orbit with
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n = 7. What is the calculated energy absorbed by the electron?
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ANSWER